Answer:
Option A is correct.
{-8, 0, 5 , 6}
Explanation:
An Integer is defined as a whole number which is negative, positive or zero but not a fractional number.
As per the statement:
Given that the numbers:

By definition of integers;
The numbers which are integer:
-8,
0,
5 and
6
therefore, the element in the set are integers : {-8, 0, 5 , 6}